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Heat convertible resin composition and its preparing process

A resin composition and thermosetting technology, which is applied in the field of thermosetting resin composition and its preparation, can solve the problems of affecting the mechanical properties of composite materials, reducing the polarity of the resin, and reducing the bonding performance of the interface between the resin and the reinforcing fiber, and achieving excellent interlayer shear. The effects of shear strength, high glass transition temperature, and excellent mechanical properties

Active Publication Date: 2008-01-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high degree of allylation in this resin system reduces the polarity of the resin, which leads to a decrease in the interface bonding performance between the resin and the reinforcing fiber in the composite material, which in turn affects the mechanical properties of the composite material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of rearranged allyl novolac resins

[0020] 1. Preparation of allyl etherified novolak resin

[0021] Add 80 g of phenol and 60.9 g of formaldehyde (37% aqueous solution) into the reaction flask. The temperature was raised to 65° C. under stirring, and 0.484 g of oxalic acid was added. Continue to heat up to 95°C, and react at this temperature for 180min. After the reaction, wash with deionized water until pH=6.5. After dehydration under reduced pressure, novolak resin was obtained, and its number average molecular weight was 450.

[0022] Add 35 g of the above-mentioned novolac resin into the reaction flask, and add 49 g of n-butanol. Heat up and start stirring, and the temperature rises to about 70°C. After it was completely dissolved, 26 g of potassium hydroxide was added. After the potassium hydroxide was dissolved, the temperature was kept for 1 hour, and then the temperature of the system was lowered to 45°C. Slowly add 38 g of allyl chloride ...

Embodiment 2

[0034] 1. Preparation of rearranged allyl novolac resins

[0035] 1. Preparation of allyl etherified novolak resin

[0036] Add 80g of phenol and 22.53g of paraformaldehyde into the reaction flask. The temperature was raised to 65° C. under stirring, and 0.484 g of oxalic acid was added. Continue to heat up to 95°C, and react at this temperature for 180min. After the reaction, wash with deionized water until pH=6.5. After dehydration under reduced pressure, novolak resin was obtained, and its number average molecular weight was 450.

[0037] Add 35 g of the above-mentioned novolac resin into the reaction flask, and add 49 g of n-butanol. Heat up and start stirring, and the temperature rises to about 70°C. After it was completely dissolved, 26 g of potassium hydroxide was added. After the potassium hydroxide was dissolved, the temperature was kept for 1 hour, and then the temperature of the system was lowered to 45°C. Slowly add 38 g of allyl chloride within 60 min. Rais...

Embodiment 3

[0049] 1. Preparation of rearranged allyl novolac resins

[0050] 1. Preparation of allyl etherified novolak resin

[0051] Add 80 g of phenol and 60.9 g of formaldehyde (37% aqueous solution) into the reaction flask. The temperature was raised to 65° C. under stirring, and 0.484 g of oxalic acid was added. Continue to heat up to 95°C, and react at this temperature for 180min. After the reaction, wash with deionized water until pH=6.5. After dehydration under reduced pressure, novolak resin was obtained, and its number average molecular weight was 450.

[0052] Add 35 g of the above-mentioned novolac resin into the reaction flask, and add 49 g of n-butanol. Heat up and start stirring, and the temperature rises to about 70°C. After it was completely dissolved, 26 g of potassium hydroxide was added. After the potassium hydroxide was dissolved, the temperature was kept for 1 hour, and then the temperature of the system was lowered to 45°C. Slowly add 38 g of allyl chloride ...

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Abstract

The invention discloses a thermosetting resin combination and a preparation method of the thermosetting resin combination. The thermosetting resin combination is prepared by prepolymerization reaction between Claisen rearrangement allylated novolac resins whose weight percentage is of 66 to 90 percent and bismaleimide monomers whose weight percentage is of 10 to 34 percents in the temperature of 100 to 150 DEG C. The Claisen rearrangement allyl novolac resin is made through a Claisen rearrangement reaction of allyl etherified novolac resins. The bismaleimide monomers are provided with a formula I structure, wherein, R1 and R2 are H; R is (see above graph). The invention is not only in high glass transition temperature, but also in fine resistance to heat deterioration performance. Fiber reinforced composites of the invention has high temperature strength / modulus retention, which can be used for preparing high temperature resistant composites that is used temporarily under the temperature of 350 DEG C, and can be applied widely in manufacturing the high temperature resistant composites such as matrix resins for missile radomes in aerospace industry.

Description

technical field [0001] The invention relates to a thermosetting resin composition and a preparation method thereof. Background technique [0002] High temperature resistant resins are widely used in aviation, aerospace, electronics, machinery and other fields, and play an important role in human production and life. Generally speaking, there are two main ways to improve the high temperature resistance of resins: one is to increase the content of high temperature resistant groups such as benzene rings in the molecule, and avoid the existence of easily decomposed structures such as long aliphatic chains and ether bonds. ; The other is to increase the cross-linking density of the resin. Traditional structural materials use high-temperature-resistant resins such as polyimide and polybenzimidazole, which contain a large number of aromatic structures in their molecules, and are also cross-linked and cured by forming a trapezoidal structure. It eliminates the disadvantages of pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/30C08L61/06
Inventor 赵彤刘锋
Owner INST OF CHEM CHINESE ACAD OF SCI
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